I enjoyed this video a lot. The transformation in this depressed goat is quite remarkable. The animal sanctuary said he had refused to eat or go outside for six days. He was energetic and eating within minutes of reuniting with his old friend.
Oh that video was so sweet. There doesn’t seem to be any doubt that the goat was pining for his friend.
No doubt whatsoever. Sweet.
If you like that kind of thing, here’s two more.
This Dutch clip of last month shows a male swan reunited with its lifemate after 14 days. The swan had become ill with botulism and had been nursed back to health in an rescue center.
Here’s a clip of a baby elephant. It had gotten trapped in a mud hole and its mother had been unable to get it out. Rescue workers came in with rope and their car to pull the calf out. They had to chase off the panicked mother elephant so she wouldn’t trample the rescue crew in her panic. The end where mom and calf run at each other, the mom calling in those low tones, had me in tears. Still, why doesn’t that crew make less steep slopes in the mud holes, if that many elephants keep falling in?
Then there’s the pictures of a man dying of cancer, being allowed to say goodbye to the giraffes he helped care for at a Dutch zoo.
There’s a wonderful Nova episode about animal friendships that includes a goat at an animal rescue which befriended a blind horse and led it from the paddock to its favorite field every day. The thing is, there was nothing in the field to interest the goat. It’s food was in another area, it like the shade in the woods better, and the water was back in the paddock. But every day, that goat led the horse to the field, staying about ten feet ahead and baaing if the horse paused for very long, and every day, it led the horse back. So, it really was behaving in an altruistic manner. It really was acting like - dare I say it? - the horse was its friend.
There was an update at the end of the episode. The horse had died out in the pasture, and the goat went to the rescue owner while she was working in the paddock and alerted her. Since then, the goat hasn’t gone back out to the field, and the owner is fairly sure it (well, she, IIRC) won’t live much longer. The goat’s work was done, and so was the goat.
Phouka, got a link to that documentary? I’d love to see it.
Here’s another clip, of a crow adopting a kitten and them staying friends.
Youtube search for animal friendships gave this compilation of 23 instances. No background, though. Sometimes animal friendships are an animal imprinting on or forming a pair bond with the “wrong” species. To some degrees that happens with us humans, too. A lot of my passion for my cats was unused mothering. 
But quite often, animals have all the “right” instincts and imprints and they still form friendships with other species. I was hoping that such instances, put on film, would make the idea of animal individuality more real for the human viewers. Because untill now, such anecdotes were mostly not believed in the absence of visual proof and because animals in scientific lab circumstances would hardly exhibit such nuanced behavior.
This clip is amazing too. A wild leopard seal, that never had seen a diver before, and wanted to FEED the diver.
I heard about that on Radiolab. It’s such a sweet and heartwarming story, until you stop and think about how those penguins must have felt. 
Great stuff. 
I alway enjoy animal clips like these.
Here. Story and video is partway down the page.
Jack the goat and Charlie the horse. From PBS’ “Animal Odd Couples”. I’ve seen it as well, a couple of times. Very moving.
ETA: I clicked aceplace57’s link. Different goat and horse. Sorry.
That’s the one JimBuff. And it turns out it was an episode of Nature, not Nova. Here’s the full episode: